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Dissolution of Ripidolite (Mg, Fe-Chlorite) in Organic and Inorganic Acid Solutions

^a Institut fuer Bodenkunde, Univ. Bonn, Nussallee 13, D-53115 Bonn, Germany
^b Soil and Water Sciences program, Dep. of Environ. Sci., Univ. of California, Riverside, CA 92521-0424
^c Central Facility for Advanced Microscopy and Microanalysis, Univ. of California, Riverside, CA 92521

View larger version (21K): [in a new window]   Fig. 1. X-ray diffraction pattern of randomly oriented pretreated ripidolite from 2 to 65° 2 theta and enlargement of the 35 to 65° 2 theta area (125- to 38-µm fraction); spacing in Å.

View larger version (111K): [in a new window]   Fig. 2. Scanning electron microscope image of a pretreated ripidolite grain (125- to 38-µm fraction; treated two times with 10 mM HCl and two times with distilled water).

View larger version (27K): [in a new window]   Fig. 3. Ripidolite dissolution rates (R), determined on the basis of the sum of released framework elements, in the presence of 10 mM inorganic and organic acid solutions.

View larger version (14K): [in a new window]   Fig. 4. Ripidolite dissolution rates (R), determined on the basis of the sum of released framework elements, at increasing HNO3 concentrations (circles) and dissolution rates calculated by means of Eq. [2] (line).

View larger version (25K): [in a new window]   Fig. 5. Log dissolution rates (log R) of ripidolite vs. pH (data points) in inorganic and organic acid solutions and pH dependence calculated by means of Eq. [3] (straight lines).

View larger version (32K): [in a new window]   Fig. 6. Element ratios in the presence of inorganic (IO) and organic acids (OA) vs. pH. Dotted line represents the element ratio of the initial mineral.